runtime.sendMessage doesn't pass callback to onMessage listeners

[kmarple1]

I'm attempting to test my onMessage listeners, but I keep getting the error TypeError: sendResponse is not a function. It appears that the implementation of runtime.sendMessage accepts a callback as the second argument, but doesn't actually pass it to the listener.

My workaround thus far has been to pass a default value to my listeners, ex:
browser.runtime.onMessage.addListener((request, sender, sendResponse = () => {}) => {

While this gets rid of the error, not being able to check the results passed to the callback make the test almost useless.

[Rob--W]

How are you testing this?

The current version of the polyfill passes the sendResponse listener at

webextension-polyfill/src/browser-polyfill.js

Line 422 in 50be150

result = listener(message, sender, wrappedSendResponse);

This behavior was introduced in version 0.3.0 and is still present in the latest version (0.8.0). Are you using the latest version of the polyfill?

[kmarple1]

OK, I actually posted this in the wrong repo; I meant to post it to clarkbw/jest-webextension-mock. If I try to use the polyfill directly from jest, I always get the error This script should only be loaded in a browser extension.

[Rob--W]

Closing since this is bug report is unrelated to this project and a bug report has been filed at clarkbw/jest-webextension-mock#136

[escapedcat]

Just for others ending up here, this helped me: #218 (comment)